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-rw-r--r--lib/PublicInbox/WwwText.pm4
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/PublicInbox/WwwText.pm b/lib/PublicInbox/WwwText.pm
index 2e58eeb4..449cb499 100644
--- a/lib/PublicInbox/WwwText.pm
+++ b/lib/PublicInbox/WwwText.pm
@@ -181,6 +181,10 @@ message threading
         $WIKI_URL/Atom_(standard)
         https://tools.ietf.org/html/rfc4287
 
+      Atom Threading Extensions (RFC4685) is supported:
+
+        https://tools.ietf.org/html/rfc4685
+
     Finally, the gzipped mbox for a thread is available for
     downloading and importing into your favorite mail client: